This item is a few weeks old, sent along by xoB, but it's the sort of item that's timeless anyway. These two children are twins, born to the mother and father shown above.
xoB sends along the
original Daily Mail article and the
Snopes page that verify that this is, in fact, a case of twins born to the same father. Genetically, you could imagine how it might happen - but the Daily Mail article explains the genetics behind it, and rates the chances of it happening at about a million to one.